<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <script src="jquery.js"></script>
    <script type="text/javascript">
      Promise.all([
        $.ajax({url: 'data/arr.txt', dataType: 'json'}),
        $.ajax({url: 'data/json.txt', dataType: 'json'}),
        $.ajax({url: 'data/num.txt', dataType: 'json'})
      ]).then(results=>{
        alert('sucess ');
        let [arr, json, num] = results;
        console.log(arr,json,num);
      }
      , err=>{
        alert('fail');
      }
    );

    </script>
  </head>
  <body>

  </body>
</html>
